I had the 18th in my FTX Blaze and if I read your post correctly, the car is stopped, you put on some throttle and it is as if the motor is not able to rotate smoothly?
I had the same and eventually the ESC let out the magic smoke. I met one of the Horizon guys at WLRC in the UK and he took it back to the office to check it out. Turns out there was an issue with the FET's.
If you bought it 2nd hand, I am not sure if you are still covered, but I would get it sent in, just to be on the safe side.
Get in touch with Horizon and see what they can see on the unit for you.
Good luck
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